World Mission Sunday: American perspective
The first collection for what would eventually become World Mission Sunday was taken up in 1822, the inspiration of a French consecrated virgin by the name of Pauline Jaricot, who was the founder of the Society for the Propagation of the Faith. Aside from China, the proceeds of that collection went to support what was then the Diocese of Louisiana and the Two Floridas, which at the time stretched from Florida to Canada and was considered mission territory.
Source: CRUXnow